PLOT Dinosaurs reappearing on Earth, stronger and more intelligent than before, led by Dinosaur Satan Gottes, and this time they are back to rule earth once more and wipe out humankind. They are alive and even thriving, in an underground Empire they built. In 1986, Ururu, the leader of dinosaurs, declares war against humanity. In an attempt to reclaim the Earth's surface, some of the dinosaurs evolve into deadly monsters, and start wreaking havoc on the human population centers around the globe. Story revolves around the D Force, and its two members, a brother and sister team of Tachibana Ai and Tachibana Zen, the Special OPs force, whose mission is to combat monsterized dinosaurs and protecting the humanity at all cost. However, early in the series the siblings suffered a near fatal injury from the massive explosion during the test of a prototype super-tank, "predecessor to Izenborg". However they survived, barely clinging to life. But in order to keep them alive they needed to receive a cybernetic body parts and other implants so they could function normally within the society, and to synchronize with their combat vehicle and form Aizenborg (Ai + Zen + Cyborg) (called Gemini in the US movie) and fight the Dino-Army.

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